<!DOCTYPE html>
<html>
  <head>
    <title>画点，线，面</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script type="text/javascript" src="../js/jquery.min.js" ></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
    <script type="text/javascript" src="../js/line_Polygon_Circle/draw.js" ></script>
    <link rel="stylesheet" href="../js/line_Polygon_Circle/draw.css" />
  </head>
  <body>
   <div id="map">  
        <div id="menu">  
            <label>测量类型选择</label>  
            <select id="type">  
                <option value="length">长度</option>  
                <option value="area">面积</option>  
            </select>  
            <label class="checkbox"><input type="checkbox" id="geodesic" />使用大地测量</label> 
            <button type="button" id="clearlayer" >清除</button>
        </div>  
    </div>  
    <div id="scalebar"></div>  
  </body>
</html>